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<FONT color="green">001</FONT>    <a name="line.1"></a>
<FONT color="green">002</FONT>    package org.bukkit.util.noise;<a name="line.2"></a>
<FONT color="green">003</FONT>    <a name="line.3"></a>
<FONT color="green">004</FONT>    /**<a name="line.4"></a>
<FONT color="green">005</FONT>     * Base class for all noise generators<a name="line.5"></a>
<FONT color="green">006</FONT>     */<a name="line.6"></a>
<FONT color="green">007</FONT>    public abstract class NoiseGenerator {<a name="line.7"></a>
<FONT color="green">008</FONT>        protected final int perm[] = new int[512];<a name="line.8"></a>
<FONT color="green">009</FONT>        protected double offsetX;<a name="line.9"></a>
<FONT color="green">010</FONT>        protected double offsetY;<a name="line.10"></a>
<FONT color="green">011</FONT>        protected double offsetZ;<a name="line.11"></a>
<FONT color="green">012</FONT>    <a name="line.12"></a>
<FONT color="green">013</FONT>        /**<a name="line.13"></a>
<FONT color="green">014</FONT>         * Speedy floor, faster than (int)Math.floor(x)<a name="line.14"></a>
<FONT color="green">015</FONT>         * <a name="line.15"></a>
<FONT color="green">016</FONT>         * @param x Value to floor<a name="line.16"></a>
<FONT color="green">017</FONT>         * @return Floored value<a name="line.17"></a>
<FONT color="green">018</FONT>         */<a name="line.18"></a>
<FONT color="green">019</FONT>        public static int floor(double x) {<a name="line.19"></a>
<FONT color="green">020</FONT>            return (int)Math.floor(x);<a name="line.20"></a>
<FONT color="green">021</FONT>        }<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>        protected static double fade(double x) {<a name="line.23"></a>
<FONT color="green">024</FONT>            return x * x * x * (x * (x * 6 - 15) + 10);<a name="line.24"></a>
<FONT color="green">025</FONT>        }<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>        protected static double lerp(double x, double y, double z) {<a name="line.27"></a>
<FONT color="green">028</FONT>            return y + x * (z - y);<a name="line.28"></a>
<FONT color="green">029</FONT>        }<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>        protected static double grad(int hash, double x, double y, double z) {<a name="line.31"></a>
<FONT color="green">032</FONT>            hash &amp;= 15;<a name="line.32"></a>
<FONT color="green">033</FONT>            double u = hash &lt; 8 ? x : y;<a name="line.33"></a>
<FONT color="green">034</FONT>            double v = hash &lt; 4 ? y : hash == 12 || hash == 14 ? x : z;<a name="line.34"></a>
<FONT color="green">035</FONT>            return ((hash &amp; 1) == 0 ? u : -u) + ((hash &amp; 2) == 0 ? v : -v);<a name="line.35"></a>
<FONT color="green">036</FONT>        }<a name="line.36"></a>
<FONT color="green">037</FONT>    <a name="line.37"></a>
<FONT color="green">038</FONT>        /**<a name="line.38"></a>
<FONT color="green">039</FONT>         * Computes and returns the 1D noise for the given coordinate in 1D space<a name="line.39"></a>
<FONT color="green">040</FONT>         *<a name="line.40"></a>
<FONT color="green">041</FONT>         * @param x X coordinate<a name="line.41"></a>
<FONT color="green">042</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.42"></a>
<FONT color="green">043</FONT>         */<a name="line.43"></a>
<FONT color="green">044</FONT>        public double noise(double x) {<a name="line.44"></a>
<FONT color="green">045</FONT>            return noise(x, 0, 0);<a name="line.45"></a>
<FONT color="green">046</FONT>        }<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        /**<a name="line.48"></a>
<FONT color="green">049</FONT>         * Computes and returns the 2D noise for the given coordinates in 2D space<a name="line.49"></a>
<FONT color="green">050</FONT>         *<a name="line.50"></a>
<FONT color="green">051</FONT>         * @param x X coordinate<a name="line.51"></a>
<FONT color="green">052</FONT>         * @param y Y coordinate<a name="line.52"></a>
<FONT color="green">053</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.53"></a>
<FONT color="green">054</FONT>         */<a name="line.54"></a>
<FONT color="green">055</FONT>        public double noise(double x, double y) {<a name="line.55"></a>
<FONT color="green">056</FONT>            return noise(x, y, 0);<a name="line.56"></a>
<FONT color="green">057</FONT>        }<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        /**<a name="line.59"></a>
<FONT color="green">060</FONT>         * Computes and returns the 3D noise for the given coordinates in 3D space<a name="line.60"></a>
<FONT color="green">061</FONT>         *<a name="line.61"></a>
<FONT color="green">062</FONT>         * @param x X coordinate<a name="line.62"></a>
<FONT color="green">063</FONT>         * @param y Y coordinate<a name="line.63"></a>
<FONT color="green">064</FONT>         * @param z Z coordinate<a name="line.64"></a>
<FONT color="green">065</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.65"></a>
<FONT color="green">066</FONT>         */<a name="line.66"></a>
<FONT color="green">067</FONT>        public abstract double noise(double x, double y, double z);<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>        /**<a name="line.69"></a>
<FONT color="green">070</FONT>         * Generates noise for the 1D coordinates using the specified number of octaves and parameters<a name="line.70"></a>
<FONT color="green">071</FONT>         *<a name="line.71"></a>
<FONT color="green">072</FONT>         * @param x X-coordinate<a name="line.72"></a>
<FONT color="green">073</FONT>         * @param octaves Number of octaves to use<a name="line.73"></a>
<FONT color="green">074</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.74"></a>
<FONT color="green">075</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.75"></a>
<FONT color="green">076</FONT>         * @return Resulting noise<a name="line.76"></a>
<FONT color="green">077</FONT>         */<a name="line.77"></a>
<FONT color="green">078</FONT>        public double noise(double x, int octaves, double frequency, double amplitude) {<a name="line.78"></a>
<FONT color="green">079</FONT>            return noise(x, 0, 0, octaves, frequency, amplitude);<a name="line.79"></a>
<FONT color="green">080</FONT>        }<a name="line.80"></a>
<FONT color="green">081</FONT>    <a name="line.81"></a>
<FONT color="green">082</FONT>        /**<a name="line.82"></a>
<FONT color="green">083</FONT>         * Generates noise for the 2D coordinates using the specified number of octaves and parameters<a name="line.83"></a>
<FONT color="green">084</FONT>         *<a name="line.84"></a>
<FONT color="green">085</FONT>         * @param x X-coordinate<a name="line.85"></a>
<FONT color="green">086</FONT>         * @param y Y-coordinate<a name="line.86"></a>
<FONT color="green">087</FONT>         * @param octaves Number of octaves to use<a name="line.87"></a>
<FONT color="green">088</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.88"></a>
<FONT color="green">089</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.89"></a>
<FONT color="green">090</FONT>         * @return Resulting noise<a name="line.90"></a>
<FONT color="green">091</FONT>         */<a name="line.91"></a>
<FONT color="green">092</FONT>        public double noise(double x, double y, int octaves, double frequency, double amplitude) {<a name="line.92"></a>
<FONT color="green">093</FONT>            return noise(x, y, 0, octaves, frequency, amplitude);<a name="line.93"></a>
<FONT color="green">094</FONT>        }<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>        /**<a name="line.96"></a>
<FONT color="green">097</FONT>         * Generates noise for the 3D coordinates using the specified number of octaves and parameters<a name="line.97"></a>
<FONT color="green">098</FONT>         *<a name="line.98"></a>
<FONT color="green">099</FONT>         * @param x X-coordinate<a name="line.99"></a>
<FONT color="green">100</FONT>         * @param y Y-coordinate<a name="line.100"></a>
<FONT color="green">101</FONT>         * @param z Z-coordinate<a name="line.101"></a>
<FONT color="green">102</FONT>         * @param octaves Number of octaves to use<a name="line.102"></a>
<FONT color="green">103</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.103"></a>
<FONT color="green">104</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.104"></a>
<FONT color="green">105</FONT>         * @return Resulting noise<a name="line.105"></a>
<FONT color="green">106</FONT>         */<a name="line.106"></a>
<FONT color="green">107</FONT>        public double noise(double x, double y, double z, int octaves, double frequency, double amplitude) {<a name="line.107"></a>
<FONT color="green">108</FONT>            double result = 0;<a name="line.108"></a>
<FONT color="green">109</FONT>            double amp = 1;<a name="line.109"></a>
<FONT color="green">110</FONT>            double freq = 1;<a name="line.110"></a>
<FONT color="green">111</FONT>    <a name="line.111"></a>
<FONT color="green">112</FONT>            for (int i = 0; i &lt; octaves; i++) {<a name="line.112"></a>
<FONT color="green">113</FONT>                result += noise(x * freq, y * freq, z * freq) * amp;<a name="line.113"></a>
<FONT color="green">114</FONT>                freq *= frequency;<a name="line.114"></a>
<FONT color="green">115</FONT>                amp *= amplitude;<a name="line.115"></a>
<FONT color="green">116</FONT>            }<a name="line.116"></a>
<FONT color="green">117</FONT>    <a name="line.117"></a>
<FONT color="green">118</FONT>            return result;<a name="line.118"></a>
<FONT color="green">119</FONT>        }<a name="line.119"></a>
<FONT color="green">120</FONT>    }<a name="line.120"></a>




























































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